21036232 has 16 divisors (see below), whose sum is σ = 45077760. Its totient is φ = 9015504.

The previous prime is 21036229. The next prime is 21036233. The reversal of 21036232 is 23263012.

It is not an unprimeable number, because it can be changed into a prime (21036233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187768 + ... + 187879.

It is an arithmetic number, because the mean of its divisors is an integer number (2817360).

Almost surely, 2^21036232 is an apocalyptic number.

It is an amenable number.

21036232 is an abundant number, since it is smaller than the sum of its proper divisors (24041528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21036232 is a wasteful number, since it uses less digits than its factorization.

21036232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375660 (or 375656 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21036232 is about 4586.5272265626. The cubic root of 21036232 is about 276.0509952681.

Adding to 21036232 its reverse (23263012), we get a palindrome (44299244).

The spelling of 21036232 in words is "twenty-one million, thirty-six thousand, two hundred thirty-two".